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1.3

Major VersionM

by Procheta Mallik

Introduction

A stethoscope is a medical instrument to listening to a patient's heartbeat or breathing, and typically has a small disc-shaped resonator that is placed against the chest, and two tubes connected to earpieces. Here, we insert pipes in a cut ball and insert binding wire to the pipes to give them the shape of a stethoscope. Foam pieces are fixed at the other end of the rubber pipes to make the ear plugs. A cut balloon is used as the chest-piece resonator.

    • Be careful while using the scissors and paper cutter, or any other sharp tool.

    • Do not push the pipes too hard into the ears.

  1. Cut the total length of plastic tube (diameter 6mm) into two equal halves. Cut the total length of plastic tube (diameter 6mm) into two equal halves. Cut the total length of plastic tube (diameter 6mm) into two equal halves.
    • Cut the total length of plastic tube (diameter 6mm) into two equal halves.

  2. Cut  the plastic ball in half using a cutter and scissors. Trim and even out the plastic ball with scissors. Trim and even out the plastic ball with scissors.
    • Cut the plastic ball in half using a cutter and scissors.

    • Trim and even out the plastic ball with scissors.

  3. Using a marker pen,  mark the outline of the plastic tube openings on the cut plastic ball; make 2 such adjacent circles. Push one blade of the scissors into one of the circles and rotate it to make a hole of that size. Do the same for the other hole. Insert a plastic tube each into the holes made on the plastic ball.
    • Using a marker pen, mark the outline of the plastic tube openings on the cut plastic ball; make 2 such adjacent circles.

    • Push one blade of the scissors into one of the circles and rotate it to make a hole of that size. Do the same for the other hole.

    • Insert a plastic tube each into the holes made on the plastic ball.

    • The holes shouldn't be too small or too big. The plastic tubes shouldn't get squeezed.

  4. Cut the mouth of a medium sized balloon and stretch the balloon enough to remove any wrinkles when wrapped over the cut plastic ball. Pull the medium sized balloon from the sides to stretch  it adequately. Thus wrap the cut balloon over the cut ball and secure it around the pipes with a rubber band, if necessary
    • Cut the mouth of a medium sized balloon and stretch the balloon enough to remove any wrinkles when wrapped over the cut plastic ball.

    • Pull the medium sized balloon from the sides to stretch it adequately.

    • Thus wrap the cut balloon over the cut ball and secure it around the pipes with a rubber band, if necessary

    • Make the edges of the cut ball smooth by using some tape to avoid tearing of the balloon while stretching it over the edge of the ball.

  5. Mark two points at a distance of 6 cm and 4 cm from the ends on either side of the wire. Bend the wire inwards, at the points that are marked, such that you get the two ends of the wire pointing at each other. Bend the wire inwards, at the points that are marked, such that you get the two ends of the wire pointing at each other.
    • Mark two points at a distance of 6 cm and 4 cm from the ends on either side of the wire.

    • Bend the wire inwards, at the points that are marked, such that you get the two ends of the wire pointing at each other.

  6. You should now have the wire bent such that the shape resembles a stethoscope's ear-tubes. You should now have the wire bent such that the shape resembles a stethoscope's ear-tubes. You should now have the wire bent such that the shape resembles a stethoscope's ear-tubes.
    • You should now have the wire bent such that the shape resembles a stethoscope's ear-tubes.

  7. Make marks on the tube at a distance of about 21 cm from the open ends. Pierce a hole, using scissors at both the marked points. Pierce a hole, using scissors at both the marked points.
    • Make marks on the tube at a distance of about 21 cm from the open ends.

    • Pierce a hole, using scissors at both the marked points.

  8. Insert each end of the wire through the holes up along the length of the plastic tubes. Make sure the end point of the wire inside the plastic tube is at a distance of about 1 cm from the end of the plastic tube. If need be, cut the excess tube to achieve a 1-cm distance between the end of the plastic tube and the wire inside it.
    • Insert each end of the wire through the holes up along the length of the plastic tubes.

    • Make sure the end point of the wire inside the plastic tube is at a distance of about 1 cm from the end of the plastic tube.

    • If need be, cut the excess tube to achieve a 1-cm distance between the end of the plastic tube and the wire inside it.

  9. Secure the wire and pipes with tape so as to avoid any movement between them. Also wrap the tubes together with tape further up the tubes; the balloon may also be taped to the tubes. Also wrap the tubes together with tape further up the tubes; the balloon may also be taped to the tubes.
    • Secure the wire and pipes with tape so as to avoid any movement between them.

    • Also wrap the tubes together with tape further up the tubes; the balloon may also be taped to the tubes.

  10. Stick tape to the foam piece, as shown, and wrap around the ends of the plastic tubes. Keep half the width of the foam piece protruding out ahead of the end of the plastic tube. These act as your ear-plugs; the foam intended to provide a soft and comfortable feeling inside your ears.
    • Stick tape to the foam piece, as shown, and wrap around the ends of the plastic tubes.

    • Keep half the width of the foam piece protruding out ahead of the end of the plastic tube.

    • These act as your ear-plugs; the foam intended to provide a soft and comfortable feeling inside your ears.

  11. Place the chest piece on your chest and move it around to hear your heart calling out "lub - dub"! Place the chest piece on your chest and move it around to hear your heart calling out "lub - dub"! Place the chest piece on your chest and move it around to hear your heart calling out "lub - dub"!
    • Place the chest piece on your chest and move it around to hear your heart calling out "lub - dub"!

    • No gap should be present between the balloon and pipes within the chest piece. This will hinder the sound waves travelling through the pipes.

    • Balloon not stretched enough to create vibrations by low frequencies like that of heart beats.

    • Pipes within the chest piece are not inserted firmly, which creates unwanted sounds when it rubs the inside of the chest piece.

    • Not enough curvature in the binaural near the ear-end, which might cause pipes to come out of the ears while using.

  12. Fill the observation table.
    • Fill the observation table.

  13. Cling wrap as the diaphragm. Butter paper as the diaphragm. Changing the diameter of the chest piece.
    • Cling wrap as the diaphragm.

    • Butter paper as the diaphragm.

    • Changing the diameter of the chest piece.

    • Click on DIY Stethoscope (Variations) to make these variations.

Finish Line

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Suhail Ahanger

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